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Tube-I-zator Professional PCB

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dvb projekt

dvb projekt

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dvb projekt

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joemana said:
dvb-projekt said:
It must be stable ~170VDC if you come from a 150VAC tap of your transformer.


Oliver,

Is it okay if I have 220VDC or do I have to reduce it first to 170VDV ? Also, may I know the resistor value of your RK and I/V on your Tube-I-Zator.

Thanks,

Joe
Click to expand...

Hi Joe,

you must measure the input voltage with the reg. (~35mA load).
If you have with the load 220VDC input voltage, i think you must use a bigger sink!

The resistor values for a 6N2P/12AX7 is Rk=200R.
The R I/V depends on the DAC Chip you would like to use. If it is the TDA1541A i would recommend 56R with one DAC Chip.
Click to expand...
 
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joemana

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dvb-projekt said:
joemana said:
The R I/V depends on the DAC Chip you would like to use. If it is the TDA1541A i would recommend 56R with one DAC Chip.
Click to expand...

Oliver, thank you much for your help.
I'll just reduce the B1 voltage with resistor as I don't want to change the heat sink size. What is the minimum input voltage for the HV shunt?
I have the Buffalo II DAC. I'll check the older thread, maybe a couple of Buf II owner/posters mentioned what R I/V value they are using.

Thanks,

Joe
Click to expand...
 
Last edited:
dvb projekt

dvb projekt

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Joined 2009
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joemana said:
dvb-projekt said:
Oliver, thank you much for your help.
I'll just reduce the B1 voltage with resistor as I don't want to change the heat sink size. What is the minimum input voltage for the HV shunt?
I have the Buffalo II DAC. I'll check the older thread, maybe a couple of Buf II owner/posters mentioned what R I/V value they are using.

Thanks,

Joe
Click to expand...

Salas recommend a Vin/Vout diff. of minimum 15-20V.
Click to expand...
 
dvb projekt

dvb projekt

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Tube-I-zator Pre-Orders:
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dvb projekt

dvb projekt

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Joined 2009
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Tube-I-zator Pre-Orders:
------------------------

Cris H. - 1x (please change to your nickname yourself!)
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northcool - 1x
acccruz - 1x
hawall841 - 1x
morpheous - 1x
neoinc - 1x
Crusty - 1x

HV-Shunt Module Pre-Order for 2nd Batch:
-----------------------------------------

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dvb projekt

dvb projekt

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Joined 2009
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joemana said:
Oliver,

The measured 220V is without the load. I also tried just after the rectifier, it's also 220V.

Thanks,

Joe
Click to expand...

Hi Joe,

your values are absolute normal and correct.
As you see on the following snapshot from the PSU Designer, there are the same values.

An externally hosted image should be here but it was not working when we last tested it.


If i add the ~35mA load from the shunt, the voltage drops to the recommended 170VDC input voltage.

An externally hosted image should be here but it was not working when we last tested it.



Best regards,
Oliver
 
dvb projekt

dvb projekt

Member
Joined 2009
Paid Member
Tube-I-zator Pre-Orders:
------------------------

Cris H. - 1x (please change to your nickname yourself!)
Jacques Merde - 2x
northcool - 1x
acccruz - 1x
hawall841 - 1x
morpheous - 1x
neoinc - 1x
Crusty - 1x

HV-Shunt Module Pre-Order for 2nd Batch:
-----------------------------------------

Jean-Charles - 2x
kamaths - 3x
bequerel - 2x
morpheous - 2x
ksnider1 - 1x
ipolyakov - 2x
savvas - 2x
 
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